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Supplemental Information on Oil and Gas Operations (Unaudited) (Proved Developed and Undeveloped Reserves) (Details) MBbls in Thousands, Mcf in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 MMBoe MBbls Mcf | Dec. 31, 2020 MMBoe MBbls Mcf | Dec. 31, 2019 MMBoe MBbls Mcf | Dec. 31, 2018 MMBoe MBbls Mcf
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | MMBoe | [1] | 752 | 757 | 823 |
Proved developed and undeveloped reserves, revisions due to prices | MMBoe | [1] | 155 | (78) | (28) |
Proved developed and undeveloped reserves, revisions other than price | MMBoe | [1] | 43 | 55 | (31) |
Proved developed and undeveloped reserves, extensions and discoveries | MMBoe | [1] | 228 | 135 | 160 |
Proved developed and undeveloped reserves, extensions and discoveries | MMBoe | [1] | 663 | 7 | 6 |
Proved developed and undeveloped reserves, production | MMBoe | [1] | (209) | (122) | (119) |
Proved developed and undeveloped reserves, sale of reserves | MMBoe | [1] | (7) | (2) | (54) |
Proved developed and undeveloped reserves, ending balance | MMBoe | [1] | 1,625 | 752 | 757 |
Proved developed reserves | MMBoe | [1] | 1,285 | 574 | 589 | 600
Proved developed producing reserves | MMBoe | [1] | 1,260 | 564 | 578 | 582
Proved undeveloped reserves | MMBoe | [1] | 340 | 178 | 168 | 223
Conversion rate of gas reserves from barrels of oil to Boe |  | 6 |  |  |
Oil [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 282 | 276 | 296 |
Proved developed and undeveloped reserves, revisions due to prices |  | 55 | (26) | (7) |
Proved developed and undeveloped reserves, revisions other than price |  | (23) | 18 | (13) |
Proved developed and undeveloped reserves, extensions and discoveries |  | 112 | 71 | 76 |
Proved developed and undeveloped reserves, extensions and discoveries |  | 393 | 1 | 3 |
Proved developed and undeveloped reserves, production |  | (106) | (57) | (55) |
Proved developed and undeveloped reserves, sale of reserves |  | (4) | (1) | (24) |
Proved developed and undeveloped reserves, ending balance |  | 709 | 282 | 276 |
Proved developed reserves |  | 544 | 194 | 198 | 196
Proved developed producing reserves |  | 533 | 190 | 191 | 188
Proved undeveloped reserves |  | 165 | 88 | 78 | 100
Natural Gas [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf |  | 1,512 | 1,621 | 1,802 |
Proved developed and undeveloped reserves, revisions due to prices | Mcf |  | 382 | (209) | (86) |
Proved developed and undeveloped reserves, revisions other than price | Mcf |  | 11 | 119 | (50) |
Proved developed and undeveloped reserves, extensions and discoveries | Mcf |  | 348 | 188 | 269 |
Proved developed and undeveloped reserves, extensions and discoveries | Mcf |  | 961 | 19 | 7 |
Proved developed and undeveloped reserves, production | Mcf |  | (325) | (221) | (219) |
Proved developed and undeveloped reserves, sale of reserves | Mcf |  | (11) | (5) | (102) |
Proved developed and undeveloped reserves, ending balance | Mcf |  | 2,878 | 1,512 | 1,621 |
Proved developed reserves | Mcf |  | 2,361 | 1,244 | 1,344 | 1,427
Proved developed producing reserves | Mcf |  | 2,316 | 1,223 | 1,327 | 1,394
Proved undeveloped reserves | Mcf |  | 517 | 268 | 277 | 375
Natural Gas Liquids [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 218 | 211 | 227 |
Proved developed and undeveloped reserves, revisions due to prices |  | 36 | (17) | (6) |
Proved developed and undeveloped reserves, revisions other than price |  | 64 | 17 | (9) |
Proved developed and undeveloped reserves, extensions and discoveries |  | 58 | 33 | 39 |
Proved developed and undeveloped reserves, extensions and discoveries |  | 110 | 3 | 1 |
Proved developed and undeveloped reserves, production |  | (48) | (28) | (28) |
Proved developed and undeveloped reserves, sale of reserves |  | (1) | (1) | (13) |
Proved developed and undeveloped reserves, ending balance |  | 437 | 218 | 211 |
Proved developed reserves |  | 348 | 173 | 167 | 166
Proved developed producing reserves |  | 341 | 171 | 165 | 162
Proved undeveloped reserves |  | 89 | 45 | 44 | 61
[1] | Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447 + Details
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